Cleaned up a bunch of little tweaks (thanks megapieman) and made some minor adjustments to stuff and things.
Tweaked the fog triggers to hopefully make it harder to cheese.
Dramatically improved visleaf cuts, cutting compile time by almost 2/3rds of how long it took before on a full compile (!)
Improved clipping in a number of places
Theoretically fixed the black brush faces, I dunno yet, I haven't looked.
More feedback is always welcome, feel free to pick them nits.
